నైరూప్య

Novel Image Contrast Enhancement for SoC of Small Mobile Display

Jin-Young Chung andKi-Doo Kim

Recently,the mobile phone has emerged as a leading icon of the convergence of consumer electronics. A wide variety of mobile phone applications such as DMB (digital multimedia broadcasting), digital photography, video telephony, and full internet browsing are now available to consumers. To meet the demands of these applications, image quality has become increasingly important. Furthermore, touch windowsare popular on mobile display panels,but they cause contrast loss because ofthe low transmittance of ITO film. This paper presents an image contrast enhancement algorithm to be embedded on aSoC.A clipped histogram stretching (CHS) method is proposed here to enable the algorithm to adapt to the input images, while an Sshaped curve algorithm and a gain/offset method are proposed for static applications. Finally, the performance of the proposed algorithm is evaluated using histograms, RGB pixel distributions, entropy values, and dynamic range values of the resulting images.